package com.itheima.reggie.controller;


import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        //截取‘.’之后的后半段
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID随机新生成的名字
        String uuidfileName = UUID.randomUUID().toString() + suffix;

        //找到目标文件夹与文件
        File dir = new File(basePath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        //目标文件
        File destFile  = new File(dir,uuidfileName);

        //把上传文件写出到目标文件上
        file.transferTo(destFile);
        return R.success(uuidfileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws IOException {
        FileInputStream fis = new FileInputStream(new File(basePath + name));

        ServletOutputStream os = response.getOutputStream();

        response.setContentType("image/jpeg");

        int len =0;
        byte[] bytes = new byte[1024];
        while ((len=fis.read(bytes)) != -1){
            os.write(bytes, 0, len);
            os.flush();
        }
        os.close();
        fis.close();
    }


}
